3.3.2 Dissected rolling low hills of the Southern Uplands

South of Colac, low hills formed on the uplifted Palaeogene sediments south of the Colac Monocline constitute the foothills to the north of the Otway Ranges. The gently undulating hills are generally rounded, although some have broader planar crests, and may be described as undulating plains. The dendritic drainage network forms tributaries to the Barwon and Gellibrand rivers. Further east (south of the Barrabool Hills) the rolling hills are less well defined and are transitional to the sedimentary plains (geomorphic unit 6.2).

North east of Princetown, the dissection of the mostly Palaeogene sediments which drape the western edge of the Otway Ranges have formed rolling hills. The drainage patterns change from dendritic along the western fringe of Otway Ranges to arcuate and vaguely rectilinear as the unit merges with the dissected sedimentary plains (unit 6.2.2). Associated soil types are mottled and non-mottled gradational soils with a sandy component, particularly in the upper soil.

Soil-landform units

Soil-landform unit	Original unit ID	Unit description	Area (km²)
84	-	Low hills-scarp (e.g. Wallington)	7
85	Barongarook L.S.	Gently undualting to rolling plain	15
86	Ferguson Hill L.S.	Undulating hills and ridges	69
87	Kennedys Creek L.S.	Undulating plain	104
88	Yeodene L.S.	Rolling plain (western Barwon River catchment and northern Gellibrand River catchment)	54
89	Anglesea L.S.	Coastal moderately dissected hills	45
90	Kawarren L.S.	Roling hills (upper northern Gellibrand River catchment)	51
91	Rivernook L.S.	Deeply dissected uplifted plains with coastal cliffs	18
92	147	Undulating plain (northern Gellibrand River catchment)	104
93	Barongarook L.S.	Gently undulating to rolling plain (western Barwon River catchment)	77

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